B3143

DTC B3143

CIRCUIT DESCRIPTION
The body control module (BCM) provides an output to the driver switch assembly through the door unlock control circuit for controlling automatic door unlock, anti lockout and keyless entry unlock functions.

CONDITIONS FOR SETTING THE DTC
- The BCM detects a short to ground on the door unlock control circuit for greater than 60 seconds.
- The BCM detects a short to battery on the door unlock control circuit for greater than 1 second.

ACTION TAKEN WHEN THE DTC SETS
- The BCM stores DTC B3142 or B3143 in memory.
- The BCM will disable the output and all operations of the output until the fault no longer exists.

CONDITIONS FOR CLEARING THE DTC
- The BCM no longer detects the short to ground on the door unlock control circuit for greater than 60 seconds.
- The BCM no longer detects the short to battery on the door unlock control circuit for greater than 1 second.
- 100 consecutive ignition cycles have been recorded without the DTC being detected.

DIAGNOSTIC AIDS
If DTC B3142 or B3143 are history DTCs, the fault may be intermittent.

TEST DESCRIPTION

Steps 1 - 8:

The numbers below refer to the step numbers on the diagnostic table.
2. Determines whether the key cylinder switch is shorted.
3. Determines whether the driver switch assembly is shorted.